Water vapor compression system, control method thereof and storage medium

Abstract

The invention provides a water vapor compression system, a control method thereof and a storage medium, the method is applied to the water vapor compression system, the system comprises a compressor, a vapor generator, a first valve and a first pressure sensor, and a gas outlet of the vapor generator is connected with a gas inlet of the compressor; the first valve is installed between an air outlet of the steam generator and an air inlet of the compressor, the first pressure sensor is installed at the air inlet of the compressor, and the method comprises the steps that a first pressure value, collected by the first pressure sensor, of steam entering the compressor is obtained, and when the first pressure value is larger than a first pressure threshold value, the opening degree of the first valve is reduced. According to the method, steam entering the compressor can be prevented from being liquefied, so that stable operation of the compressor is maintained.

Description

Technical Field

[0001] The present application relates to the field of heat pumps, and more specifically, to a water vapor compression system and a control method and a storage medium thereof in the field of heat pumps. Background Art

[0002] When using a water vapor compression system for heating, if the load on the gas-using side of the water vapor compression system changes dramatically, the amount of steam generated by the water vapor heat pump system may not match the load on the gas-using side, affecting the gas consumption on the gas-using side or the operation of the water vapor heat pump system. For example, when the load on the gas-using side suddenly decreases, due to the presence of a large amount of steam in the steam generator of the water vapor compression system, the suction pressure of the compressor of the water vapor heat pump system increases, causing the saturated steam sucked by the compressor to carry liquid, affecting the smooth operation of the compressor. Summary of the invention

[0003] The present application provides a water vapor compression system and a control method and a storage medium thereof, which can prevent the vapor entering the compressor from liquefying, thereby maintaining the stable operation of the compressor.

[0004] In a first aspect, a control method for a water vapor compression system is provided, which is applied to the water vapor compression system. The water vapor compression system includes: a compressor, a steam generator, a first valve, and a first pressure sensor. The air outlet of the steam generator is connected to the air inlet of the compressor. The first valve is installed between the air outlet of the steam generator and the air inlet of the compressor. The first pressure sensor is installed at the air inlet of the compressor. The method includes:

[0005] Acquire a first pressure value of steam entering the compressor collected by a first pressure sensor;

[0006] When the first pressure value is greater than the first pressure threshold, the opening of the first valve is reduced.

[0007] In an embodiment of the present application, when the first pressure value of the steam entering the compressor collected by the first pressure sensor is greater than the first pressure threshold, the opening of the first valve installed between the air outlet of the steam generator and the air inlet of the compressor is controlled to be reduced, which can reduce the amount of steam entering the compressor from the steam generator, and then reduce the pressure value of the air inlet of the compressor, thereby avoiding the problem of liquefaction of the steam entering the compressor due to high pressure, thereby maintaining the smooth operation of the compressor.

[0008] In a second aspect, a water vapor compression system is provided, comprising a memory for storing executable program code; and a processor for calling and running the executable program code from the memory, so that the water vapor compression system executes the method in the above-mentioned first aspect or any possible implementation of the first aspect.

[0009] According to a third aspect, a computer program product is provided, comprising: a computer program code, which, when executed on a computer, enables the computer to execute the method according to the first aspect or any possible implementation of the first aspect.

[0010] In a fourth aspect, a computer-readable storage medium is provided, which stores a computer program code. When the computer program code runs on a computer, the computer executes the method in the above-mentioned first aspect or any possible implementation manner of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a traditional water vapor compression system provided in an embodiment of the present application;

[0012] Figure 2 is a structural schematic diagram of a water vapor compression system provided in an embodiment of the present application;

[0013] Figure 3 It is a flow chart of a control method of a water vapor compression system provided in an embodiment of the present application;

[0014] Figure 4 It is a flow chart of a control method of a water vapor compression system provided in an embodiment of the present application;

[0015] Figure 5 It is a flow chart of a control method of a water vapor compression system provided in an embodiment of the present application;

[0016] Figure 6 It is a flow chart of a control method of a water vapor compression system provided in an embodiment of the present application;

[0017] Figure 7 It is a structural schematic diagram of a water vapor compression system provided in an embodiment of the present application.

[0018] Description of labels:

[0019] B1, water for steam generation; 11, medium-temperature heat pump; 12, first valve body; 13, second valve body; A1, industrial waste heat source; 14, second water pump; 15, first water pump; 16, second valve body; 21, steam generator; 22, air-water heat exchanger; 23, water pump; 24, third valve; 26, gas-liquid separator; 25, first valve; 31, compressor; 32, second valve; 33, steam return pipeline; 34, liquid return pipeline; PS1, first pressure sensor; TS1, first temperature sensor; PS3, second pressure sensor; TS3, second temperature sensor; 261, first heating component; 262, second heating component; B2, drainage pipeline. DETAILED DESCRIPTION

[0020] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0021] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0022] Figure 1 It is a structural schematic diagram of a traditional water vapor compression system provided in an embodiment of the present application.

[0023] In the traditional scheme, the steam generation water B1 is transmitted to the medium temperature heat pump 11 through the first valve body 12, and the medium temperature heat pump 11 is used to extract the waste heat from the industrial waste heat source A1 and release it into the steam generation water B1, so that the water temperature is raised to the specified flash temperature. The heated steam generation water flows into the steam generator 21 through the first water pump 15 and the second valve body 16, and flashes to become saturated steam under the pressure conditions of the steam generator 21. The saturated steam is sucked and compressed in the compressor 31, and finally becomes superheated steam. The superheated steam is sent to the heat use link after being cooled to a saturated state through the second valve 32. Optionally, if the water vapor compression system includes a gas-liquid separator 26, the steam output from the steam generator 21 will first pass through the gas-liquid separator 26 for gas-liquid separation, and then flow into the compressor 31. Optionally, the liquid in the liquid space of the steam generator 21 can flow out to the medium temperature heat pump 11 through the second water pump 14 and the second valve body 13.

[0024] If the steam demand on the demand side drops rapidly, the pressure at the compressor's air inlet will suddenly increase because the steam generator is still producing a large amount of steam, causing the saturated steam drawn by the compressor to contain liquid, affecting the smooth operation of the compressor.

[0025] Therefore, this application improves the traditional water vapor compression system, please refer to Figure 2 , Figure 2 It is a structural schematic diagram of a water vapor compression system provided in an embodiment of the present application.

[0026] In an embodiment of the present application, the water vapor compression system includes: a compressor 31, a steam generator 21, a first valve 25, and a first pressure sensor PS1. The air outlet of the steam generator 21 is connected to the air inlet of the compressor 31, the first valve 25 is installed between the air outlet of the steam generator 21 and the air inlet of the compressor 31, and the first pressure sensor PS1 is installed at the air inlet of the compressor 31.

[0027] based on Figure 2 Please refer to the schematic diagram of the water vapor compression system shown in Figure 3 , Figure 3 FIG. 1 is a flow chart of a control method for a water vapor compression system proposed in this application. Figure 3 As shown, the method of the embodiment of the present application may include the following steps S101-S102.

[0028] S101, obtaining a first pressure value of steam entering a compressor collected by a first pressure sensor;

[0029] S102: When the first pressure value is greater than a first pressure threshold, reducing the opening of the first valve.

[0030] In one embodiment, the first pressure threshold may be a preset value for determining whether the first pressure value at the air inlet of the compressor is too high, which may be determined based on factors affecting the operation of the compressor, such as the model, purpose, and operating conditions of the compressor.

[0031] In some embodiments, if the first pressure sensor detects that the first pressure value of the steam entering the compressor is greater than the first pressure threshold, it is determined that the pressure of the steam currently entering the compressor is too high, and there is a problem of steam liquefaction that affects the operation of the compressor, thereby reducing the opening of the first valve according to a preset ratio.

[0032] It can be understood that when the pressure at the air inlet of the compressor suddenly increases, by reducing the opening of the first valve installed between the air outlet of the steam generator and the air inlet of the compressor, the amount of steam flowing from the steam generator to the compressor can be effectively reduced, thereby avoiding a rapid increase in the air inlet pressure of the compressor.

[0033] In an embodiment of the present application, when the first pressure value of the steam entering the compressor collected by the first pressure sensor is greater than the first pressure threshold, the opening of the first valve installed between the air outlet of the steam generator and the air inlet of the compressor is controlled to be reduced, and the first heating component installed in the gas space of the steam is started to heat the steam. This can reduce the amount of steam entering the compressor from the steam generator, thereby reducing the pressure value of the air inlet of the compressor, avoiding the problem of liquefaction of the steam entering the compressor due to excessive pressure value, thereby maintaining the smooth operation of the compressor.

[0034] In the embodiment of the present application, the water vapor compression system may further include a gas-liquid separator 26, which is installed between the steam generator 21 and the compressor 31, and the gas outlet of the steam generator 21 is connected to the gas inlet of the gas-liquid separator 26, and the gas outlet of the gas-liquid separator 26 is connected to the gas inlet of the compressor 31, so that the steam generated by the steam generator 21 is separated by the gas-liquid separator 26 and then enters the compressor 31. Optionally, in the case where the water vapor compression system has a gas-liquid separator 26, the gas space of the steam is located at the top of the gas-liquid separator 26, and the liquid space of the steam is located at the bottom of the gas-liquid separator. Optionally, in the case where the water vapor compression system does not include the gas-liquid separator 26, the gas space of the steam is located at the top of the steam generator 21, and the liquid space of the steam is located at the bottom of the steam generator 21.

[0035] Exemplarily, the gas space where the first heating component 261 is installed can be at the top of the gas-liquid separator 26. Thus, the steam is separated into gas and liquid before entering the compressor 31, further preventing the liquefied steam from entering the compressor 31. It can be understood that if the water vapor compression system does not include the gas-liquid separator 26, the gas space where the first heating component is installed can also be at the top of the steam generator 21. In the case of the gas-liquid separator 26, the first pressure sensor is PS1; in the case of the gas-liquid separator 26, the first pressure sensor is PS2.

[0036] Optionally, in the embodiment of the present application, the steam generator 21 may be a flash tank or a shell and tube heat exchanger. Figure 2 The nozzle group in the steam heat exchanger can also be replaced by a liquid distributor or other forms of water inlet pipelines. Alternatively, the end of the water inlet pipe in the steam generator 21 can be connected to the nozzle group without the nozzle group, and the water can be directly flowed into the flash steam generator 21 for flash evaporation. A liquid distributor or other methods can also be used to increase the gas-water heat exchange area. The return liquid in the gas-liquid separator 21 can be directly introduced into the steam generator 21 to ensure smooth gas separation.

[0037] Please continue to see Figure 2 The water vapor compression system further includes a first temperature sensor TS1, which can be installed at the air inlet of the compressor 31. Similarly, when there is a gas-liquid separator 26, the first temperature sensor is TS1; when there is no gas-liquid separator 26, the first temperature sensor is TS2.

[0038] Optionally, if the first pressure sensor detects that the first pressure value of the steam entering the compressor is greater than the first pressure threshold, it is determined that the pressure of the steam currently entering the compressor is too high, and there is a problem of steam liquefaction that affects the operation of the compressor, thereby reducing the opening of the first valve based on the first pressure value, and further starting the first heating component 261 for heating according to the pre-set heating power. Exemplarily, reducing the opening of the first valve based on the first pressure value can be to determine the pressure interval where the first pressure value is located, and then determine the opening of the first valve corresponding to the pressure interval.

[0039] It can be understood that when the pressure at the air inlet of the compressor suddenly increases, by reducing the opening of the first valve 25 installed between the air outlet of the steam generator and the air inlet of the compressor, the amount of steam flowing from the steam generator to the compressor can be effectively reduced, thereby avoiding a rapid increase in the air inlet pressure of the compressor. In addition, by heating the steam through the first heating component installed in the gas space of the steam, it is equivalent to increasing the temperature of the gas space where the steam is located, thereby further avoiding the liquefaction of the steam.

[0040] Further, based on the above structure, see Figure 4 , is a flow chart of a control method for a water vapor compression system provided in an embodiment of the present application. Figure 4 As shown, the method of the embodiment of the present application may include the following steps S201-S205.

[0041] S201, obtaining a first pressure value of steam entering a compressor collected by a first pressure sensor;

[0042] S202, when the first pressure value is greater than a first pressure threshold, determining a first opening corresponding to the first pressure value, and reducing the opening of the first valve according to the first opening;

[0043] In one embodiment, after obtaining the first pressure value of the steam entering the compressor and determining that the first pressure value is greater than the first pressure threshold, the first opening corresponding to the first pressure value is determined. Alternatively, in one implementation, the mapping relationship between the first openings corresponding to the first pressure values ​​can be determined through experimental data, and then when it is determined that the first pressure value is greater than the first pressure threshold, the first pressure value can be input into the mapping relationship to obtain the first opening corresponding thereto, and the opening of the first valve can be reduced according to the first opening.

[0044] S203, obtaining a first temperature value of steam entering the compressor collected by a first temperature sensor;

[0045] S204, determining a first suction superheat of the compressor based on the first temperature value and the first pressure value;

[0046] In one embodiment, the suction superheat may be the difference between a first temperature value of the steam entering the suction port of the compressor and a saturation temperature corresponding to a first pressure value of the suction port, usually expressed in degrees Celsius.

[0047] For example, if the first pressure value is 0.21 MPa and the first temperature value is 13° C., referring to the physical property table of steam, it can be known that at a pressure of 0.21 MPa, the corresponding saturation temperature is 2° C. Then the suction superheat is: 13° C.-2° C.=11° C.

[0048] S205, determining a first power of a first heating component based on a first suction superheat, starting the first heating component according to the first power, and heating steam generated by a steam generator.

[0049] In one embodiment, the mapping relationship between the first power of the first heating component corresponding to the first suction superheat can be determined through experimental data, and then when it is determined that the first pressure value is greater than the first pressure threshold, the first suction superheat can be input into the mapping relationship to obtain the first power corresponding thereto, and the first heating component is turned on according to the first power to heat the steam generated by the steam generator.

[0050] It can be understood that in the embodiment of the present application, when the water vapor compression system includes a first heating component, the opening of the first valve can be adjusted separately according to the first opening corresponding to the first pressure value, or the heating of the first heating component can be turned on while reducing the opening of the first valve.

[0051] Further, in the embodiment of the present application, when the first pressure value of the steam entering the compressor collected by the first pressure sensor is greater than the first pressure threshold, the opening of the first valve is reduced, and the first heating component is started to heat the steam generated by the steam generator, it also includes:

[0052] S206, obtaining a second pressure value of the steam entering the compressor collected by the first pressure sensor;

[0053] S207, determining a second opening corresponding to the second pressure value, and adjusting the opening of the first valve according to the second opening;

[0054] S208, obtaining a second temperature value of the steam entering the compressor collected by the first temperature sensor;

[0055] S209, determining a second suction superheat of the compressor based on the second temperature value and the second pressure value;

[0056] S210, determining a second power of the first heating component based on the second suction superheat, and adjusting the first heating component according to the second power.

[0057] In one embodiment, after reducing the opening of the first valve according to the first pressure value and turning on the first heating component for a period of time, the second pressure value of the first pressure sensor is further collected to determine the current pressure condition of the air inlet of the compressor, and the opening of the first valve is further adjusted according to the second opening corresponding to the second pressure value, and the second temperature value of the steam entering the compressor is collected, and the second suction superheat is determined based on the second temperature value and the second pressure value, and the second power corresponding to the second suction superheat is determined, and the heating power of the first heating component is adjusted based on the second power.

[0058] It can be understood that the method of determining the second opening corresponding to the second pressure value and determining the second power corresponding to the second intake superheat is similar to the method of determining the first opening corresponding to the first pressure value and determining the first power corresponding to the first intake superheat, and will not be repeated here.

[0059] It can be understood that in the embodiment of the present application, when the water vapor compression system includes a first heating component, the opening of the first valve can be adjusted separately according to the second opening corresponding to the second pressure value, or the opening of the first valve and the heating power of the first heating component can be adjusted at the same time.

[0060] In an embodiment of the present application, the opening of the first valve can be accurately controlled by reducing the opening of the first valve with a first opening corresponding to the first pressure value; and the first heating component is started by a first power corresponding to the first suction superheat corresponding to the first pressure value and the first temperature value. Since the opening of the first valve is reduced and the first heating component is started according to the actual operating parameters of the water vapor compression system, accurate heat is provided and steam liquefaction at the air inlet of the compressor is effectively avoided; and, after reducing the opening of the first valve and starting the first heating component, the second pressure value of the air inlet of the compressor is re-collected and then the opening of the first valve is adjusted in time; and the heating power of the first heating component is adjusted based on the second suction superheat re-determined by the re-collected second pressure value and the second temperature value of the air inlet of the compressor, thereby the first valve and the heating component can be adjusted in time to maintain the smooth operation of the water vapor compression system.

[0061] Please continue to see Figure 2 As shown in the structural schematic diagram of the water vapor compression system, the water vapor compression system also includes a second heating component 262, and the second heating component 262 has a liquid space for steam. Specifically, when the water vapor compression system includes a gas-liquid separator 26, the liquid space for steam is the bottom of the gas-liquid separator, that is, the second heating component 262 is installed at the bottom of the gas-liquid separator 26; when the water vapor compression system does not include the gas-liquid separator 26, the liquid space for steam is the bottom of the steam generator 21, that is, the second heating component is installed at the bottom of the steam generator 21.

[0062] Based on the above structure, see Figure 5 , Figure 5 The present invention provides a flow chart of a method for controlling a water vapor compression system. Figure 5 As shown, the method of the embodiment of the present application may include the following steps S301-S303.

[0063] S301, obtaining a first pressure value of steam entering a compressor collected by a first pressure sensor;

[0064] S302, when the first pressure value is less than the second pressure threshold, increase the opening of the first valve based on the first pressure value, and start the second heating component to heat the liquid in the liquid space; the second pressure threshold is less than the first pressure threshold.

[0065] In one embodiment, when the first pressure value is less than the second pressure threshold, it is determined that the first pressure value of the compressor vapor is low, and the opening of the first valve is increased to increase the steam entering the compressor to avoid insufficient heating capacity of the water vapor compression system.

[0066] Furthermore, in an embodiment of the present application, while increasing the pressure of the first valve based on the first pressure value, the second heating component can also be started to heat the liquid in the liquid space. It can be understood that when the liquid space is heated, the liquid in the liquid space can be heated to vaporize it, thereby increasing the steam entering the compressor.

[0067] In some embodiments, increasing the opening of the first valve based on the first pressure value can be performed by determining a pressure range corresponding to the first pressure value, and then increasing the opening of the first valve according to the opening corresponding to the pressure range, and while increasing the opening of the first valve, starting the second heating component for heating. Exemplarily, the second heating component can be started according to a pre-set heating power to heat the liquid in the liquid space.

[0068] Further, in the embodiment of the present application, when the first pressure value is less than the second pressure threshold, the opening of the first valve can also be increased according to the opening corresponding to the first pressure value, and the second heating component 262 can be started according to the heating power corresponding to the first pressure value. It can be understood that in the embodiment of the present application, when the first pressure value is less than the second pressure threshold, the first valve can be adjusted alone, or the first valve can be adjusted and combined with the second heating component to heat the liquid in the liquid space.

[0069] Furthermore, in an embodiment of the present application, when the first pressure value is less than the second pressure threshold, the opening of the first valve is adjusted, and after the second heating component is turned on, the third pressure value of the steam entering the compressor collected by the first pressure sensor can also be collected, and the third opening corresponding to the third pressure value can be determined. The opening of the first valve is adjusted according to the third opening, the third power corresponding to the third pressure value is determined, and the second heating component is adjusted according to the third power.

[0070] It can be understood that the method of determining the third opening corresponding to the third pressure value and the method of determining the third power corresponding to the third pressure value are similar to the method of determining the first opening corresponding to the first pressure value and the method of determining the first power corresponding to the first intake superheat, which will not be repeated here.

[0071] In an embodiment of the present application, by increasing the opening of the first valve and turning on the second heating component when the first pressure value is less than the second pressure threshold, the steam flowing into the air inlet of the compressor can be increased, thereby increasing the pressure value of the air inlet of the compressor and stabilizing the operation of the water vapor compression system; and by increasing the opening of the first valve by the opening corresponding to the first pressure value, and starting the second heating component by the heating power corresponding to the first pressure value, since the opening of the first valve is increased and the second heating component is started according to the actual operating parameters of the water vapor compression system, the pressure at the air inlet of the compressor is accurately controlled, and accurate heat is provided, thereby effectively increasing the pressure at the air inlet of the compressor; and, after increasing the opening of the first valve and starting the second heating component, the third pressure value of the air inlet of the compressor is re-collected and the opening of the first valve and the heating power of the second heating component are adjusted, thereby enabling the first valve and the second heating component to be adjusted in time to maintain the smooth operation of the water vapor compression system.

[0072] Please continue to see Figure 2 As shown in the structural schematic diagram of the water vapor compression system, the water vapor compression system also includes: a second pressure sensor PS3, a second valve 32, and a steam return pipeline 33. The second pressure sensor PS3 is installed at the air outlet of the compressor 31, the steam return pipeline 33 is connected to the air outlet of the compressor 31 and the liquid space of the steam generator 21, and the second valve 32 is installed on the steam return pipeline 33.

[0073] Optionally, in the embodiment of the present application, the water vapor compression system further includes: an air-water heat exchanger 22, which is located in the liquid space of the steam generator 21 and connected to the steam return line 33. The steam passing through the compressor 31 flows through the air-water heat exchanger 22 to heat the liquid in the liquid space of the steam generator 21. The condensed water of the air-water heat exchanger 22 can be discharged from the steam generator 21 through the drainage pipe B2 of the air-water heat exchanger 22 to maintain the normal heat exchange of the air-water heat exchanger.

[0074] Based on the above structure, see Figure 6 , Figure 6 The present invention provides a flow chart of a method for controlling a water vapor compression system. Figure 6 As shown, the method of the embodiment of the present application may include the following steps S401-S403.

[0075] S401, obtaining a fourth pressure value of steam output by a compressor collected by a second pressure sensor;

[0076] S402, when the fourth pressure value is greater than the third pressure value threshold, obtaining a compression frequency of the compressor;

[0077] S403, when the compression frequency reaches a compression frequency threshold, start the second valve to transport the steam from the steam return pipeline to the liquid space, and the compression frequency threshold is the minimum compression frequency value of the compressor.

[0078] In one embodiment, when the fourth pressure value of the steam at the air outlet of the compressor collected by the second pressure sensor is greater than the third pressure threshold, it is determined that the exhaust pressure of the current compressor is too high and there is a problem of excessive steam discharge. And when it is determined that the compression frequency of the compressor has reached the compression frequency threshold, it is determined that the exhaust pressure at the air outlet cannot be reduced by reducing the compression frequency, so it is necessary to transport the steam in the compressor to the liquid space of the steam generator through the second valve installed on the steam return line connecting the air outlet of the compressor and the liquid space of the steam generator, heat the liquid in the liquid space of the steam generator, make full use of the residual steam discharged by the compressor, and avoid energy waste.

[0079] Optionally, when it is determined that the compression frequency of the compressor has not reached the compression frequency threshold, the compression frequency of the compressor may be controlled to be reduced, thereby reducing the exhaust pressure at the air outlet of the compressor.

[0080] Further, in the embodiment of the present application, the second valve can also be controlled to open according to the fourth opening corresponding to the fourth pressure value. It can be understood that the fourth opening corresponding to the fourth pressure value in the present application can also be obtained according to experimental data, which will not be repeated here.

[0081] For further information, please refer to Figure 2 In an embodiment of the present application, the water vapor compression system also includes: a liquid return pipeline 34, a second temperature sensor TS3 installed in the liquid space of the steam generator 21, and a third valve 24 and a water pump 23 installed in the liquid return pipeline. The liquid return pipeline 34 is connected to the liquid space and the gas space of the steam generator 21.

[0082] Based on the above structure, when the first pressure value collected by the first pressure sensor is less than the second pressure threshold, the third temperature value of the liquid in the liquid space collected by the second temperature sensor is obtained. When the third temperature value reaches the temperature threshold, the water pump and the third valve are turned on.

[0083] The temperature threshold may be a preset temperature value for determining whether the amount of steam generated by the steam generator can be increased by increasing the liquid passing through the liquid space, which may be T1+X, where T1 is the design water temperature of the steam generator during system design, and X is a value determined based on actual site requirements.

[0084] It can be understood that in the present application, when the exhaust pressure at the outlet of the compressor is too high, the steam in the compressor is transported to the liquid space of the steam generator through the second valve and water pump installed in the steam return pipeline connecting the outlet of the compressor and the liquid space of the steam generator, and the liquid in the liquid space of the steam generator is heated. Then, when the suction pressure at the air inlet of the compressor is less than the second pressure threshold, the liquid in the heated liquid space can be used to generate steam. Since the temperature of the liquid in the liquid space is relatively high, the amount of steam generated by the steam generator is increased.

[0085] It can be understood that in the embodiment of the present application, when the suction pressure at the air inlet of the compressor is less than the second pressure threshold, in addition to controlling the second valve, it is also possible to combine the above-mentioned embodiment to control the increase in the opening of the first valve and the opening of the second heating component to jointly increase the suction pressure at the air inlet of the compressor. Multiple components are controlled in combination to quickly increase the suction pressure at the air inlet of the compressor to the range between the second pressure threshold and the first pressure threshold, so that the compressor can operate normally.

[0086] See also Figure 7 , which is a schematic diagram of the structure of a water vapor compression system provided in the embodiment of the present application. Figure 7 As shown, the water vapor compression system 500 includes a processor 501 and a memory 502. The processor 501 is electrically connected to the memory 502.

[0087] The processor 501 is the control center of the water vapor compression system 500, and may include one or more processing cores. The processor 501 uses various interfaces and lines to connect the various parts of the entire water vapor compression system 500, and executes various functions and processes data of the water vapor compression system 500 by running or calling the computer program stored in the memory 502, and calling the data stored in the memory 502, so as to control the water vapor compression system 500 as a whole. Optionally, the processor 501 can be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field Programmable Gate Array, FPGA), and programmable logic array (Programmable Logic Array, PLA). The processor 501 can integrate one or more combinations of CPU, image processor (Graphics Processing Unit, GPU) and modem. Among them, the CPU mainly processes the operating system, user pages and applications, etc.; the GPU is responsible for rendering and drawing the display content; the modem is used to process wireless communication. It can be understood that the above-mentioned modem may also not be integrated into the processor 501, and is implemented separately through a communication chip.

[0088] The memory 502 can be used to store software programs and modules, and the processor 501 executes various functional applications and data processing by running the computer programs and modules stored in the memory 502. The memory 502 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, a computer program required for at least one function, etc.; the data storage area can store data created according to the use of the water vapor compression system 500, etc.

[0089] In addition, the memory 502 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage device. Accordingly, the memory 502 may also include a memory controller to provide the processor 501 with access to the memory 502.

[0090] In this embodiment, the processor 501 in the water vapor compression system 500 loads instructions corresponding to the processes of one or more computer programs into the memory 502 according to the following steps, and the processor 501 runs the computer program stored in the memory 502 to implement various functions, as follows:

[0091] Acquire a first pressure value of steam entering the compressor collected by the first pressure sensor;

[0092] When the first pressure value is greater than a first pressure threshold, the opening of the first valve is reduced.

[0093] Optionally, the water vapor compression system further includes a first heating component 261, and the first heating component 261 is installed in the gas space of the steam; when the processor 501 executes to reduce the opening of the first valve, it specifically executes:

[0094] The opening of the first valve 25 is reduced based on the first pressure value, and the first heating component 261 is started to heat the steam in the gas space.

[0095] Optionally, the water vapor compression system further includes a first temperature sensor TS1, which is installed at the air inlet of the compressor 31; when the processor 501 executes the step of reducing the opening of the first valve 25 based on the first pressure value and starting the first heating component 261 to heat the steam in the gas space, the processor 501 specifically executes:

[0096] determining a first opening corresponding to the first pressure value, and reducing the opening of the first valve according to the first opening;

[0097] Acquire a first temperature value of steam entering the compressor collected by the first temperature sensor;

[0098] determining a first suction superheat of the compressor based on the first temperature value and the first pressure value;

[0099] A first power of the first heating component is determined based on the first suction superheat, and the first heating component is started according to the first power to heat the steam in the gas space.

[0100] Optionally, after determining the first power of the first heating component based on the first suction superheat, starting the first heating component according to the first power, and heating the steam in the gas space, the processor 501 further executes:

[0101] Acquire a second pressure value of the steam entering the compressor collected by the first pressure sensor;

[0102] determining a second opening corresponding to the second pressure value, and adjusting the opening of the first valve according to the second opening;

[0103] Acquire a second temperature value of the steam entering the compressor collected by the first temperature sensor;

[0104] determining a second suction superheat of the compressor based on the second temperature value and the second pressure value;

[0105] A second power of the first heating component is determined based on the second suction air superheat, and the first heating component is adjusted according to the second power.

[0106] Optionally, after executing the step of acquiring the first pressure value of the steam entering the compressor 31 collected by the first pressure sensor PS1, the processor 501 further executes:

[0107] When the first pressure value is less than the second pressure threshold, the opening of the first valve 25 is increased.

[0108] Optionally, the water vapor compression system further includes a second heating component, which is installed in the liquid space of the steam. When the processor 501 increases the opening of the first valve 25, it specifically performs:

[0109] The opening of the first valve is increased based on the first pressure value, and the second heating component is started to heat the liquid in the liquid space; the second pressure threshold is less than the first pressure threshold.

[0110] Optionally, after increasing the opening of the first valve 25 based on the first pressure value and starting the second heating component, the processor 501 further executes:

[0111] Acquire a third pressure value of the steam entering the compressor collected by the first pressure sensor;

[0112] determining a third opening corresponding to the third pressure value, and adjusting the opening of the first valve according to the third opening;

[0113] Determine a third power corresponding to the third pressure value, and adjust the second heating component according to the third power.

[0114] Optionally, when the water vapor compression system includes a gas-liquid separator, the gas outlet of the steam generator is connected to the gas inlet of the gas-liquid separator, the gas outlet of the gas-liquid separator is connected to the gas inlet of the compressor, the gas space of the steam is located at the top of the gas-liquid separator, and the liquid space of the steam is located at the bottom of the gas-liquid separator; when the water vapor compression system does not include the gas-liquid separator, the gas outlet of the steam generator is connected to the gas inlet of the compressor, the gas space of the steam is located at the top of the steam generator, and the liquid space of the steam is located at the bottom of the steam generator.

[0115] Optionally, the water vapor compression system further includes: a second pressure sensor, a second valve, and a steam return pipeline, wherein the second pressure sensor is installed at the air outlet of the compressor, the steam return pipeline communicates with the air outlet of the compressor and the liquid space of the steam generator, and the second valve is installed between the steam return pipelines. The processor 501 may also execute:

[0116] Acquire a fourth pressure value of steam output by the compressor collected by the second pressure sensor;

[0117] acquiring a fourth pressure value of the steam output by the compressor collected by the second pressure sensor;

[0118] When the fourth pressure value is greater than the third pressure threshold, obtaining a compression frequency of the compressor;

[0119] When the compression frequency reaches a compression frequency threshold, the second valve is started to transport steam from the steam return pipeline to the liquid space. The compression frequency threshold is the minimum compression frequency value of the compressor.

[0120] Optionally, when the processor 501 starts the second valve to transport the steam from the steam return pipeline to the liquid space, it specifically performs:

[0121] A fourth opening corresponding to the fourth pressure value is determined, and the second valve is started according to the fourth opening to transport steam from the steam return pipeline to the liquid space.

[0122] Optionally, the water vapor compression system also includes an air-to-water heat exchanger, which is installed in the liquid space of the steam generator. The steam return pipeline connects the air outlet of the compressor and the liquid space of the steam generator through the air-to-water heat exchanger. The steam output by the compressor is transported to the air-to-water heat exchanger through the steam return pipeline to heat the liquid contained in the liquid space of the steam generator 21.

[0123] Optionally, the gas-water heat exchanger includes a drainage pipe, which is connected to the outside to transport the liquid generated after the steam exchanges heat in the gas-water heat exchanger to the outside of the steam generator.

[0124] Optionally, the water vapor compression system further includes: a liquid return pipeline, a second temperature sensor installed in the liquid space of the steam generator, and a third valve and a water pump installed in the liquid return pipeline, wherein the liquid return pipeline is connected to the liquid space and the gas space of the steam generator, and after executing the acquisition of the first pressure value collected by the first pressure sensor, the processor 501 further executes:

[0125] When the first pressure value is less than the second pressure threshold, obtaining a third temperature value of the liquid in the liquid space collected by the second temperature sensor;

[0126] When the third temperature value reaches the temperature threshold, the water pump and the third valve are turned on.

[0127] In the case of an integrated unit, the device may include a processing module and a storage module. When the device is applied to a water vapor compression system, the processing module may be used to control and manage the actions of the water vapor compression system. The storage module may be used to support the water vapor compression system to execute related program codes, etc.

[0128] The processing module may be a processor or a controller, which may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc. The storage module may be a memory.

[0129] In addition, the device provided in the embodiment of the present application can specifically be a chip, a component or a module, and the chip may include a connected processor and a memory; wherein the memory is used to store instructions, and when the processor calls and executes the instructions, the chip can execute a control method for a water vapor compression system provided in the above embodiment.

[0130] An embodiment of the present application also provides a computer-readable storage medium, in which a computer program code is stored. When the computer program code is executed on a computer, the computer executes the above-mentioned related method steps to implement a control method for a water vapor compression system provided in the above embodiment.

[0131] This embodiment also provides a computer program product. When the computer program product is run on a computer, the computer is enabled to execute the above-mentioned related steps to implement a control method for a water vapor compression system provided in the above embodiment.

[0132] Among them, the device, computer-readable storage medium, computer program product or chip provided in this embodiment is used to execute the corresponding method provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method provided above, and will not be repeated here.

[0133] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0134] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0135] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A control method for a water vapor compression system, characterized in that: Applied to a water vapor compression system, the water vapor compression system comprises: a compressor, a steam generator, a first valve, and a first pressure sensor, the steam generator is connected to the compressor, the first valve is installed between the air outlet of the steam generator and the air inlet of the compressor, the first pressure sensor is installed at the air inlet of the compressor, and the method comprises: Acquire a first pressure value of steam entering the compressor collected by the first pressure sensor; When the first pressure value is greater than a first pressure threshold, the opening of the first valve is reduced.

2. The method according to claim 1, characterized in that The water vapor compression system further includes a first heating component, which is installed in the gas space of the steam; and reducing the opening of the first valve includes: The opening of the first valve is reduced based on the first pressure value, and the first heating component is started to heat the steam in the gas space.

3. The method according to claim 2, characterized in that The water vapor compression system further includes a first temperature sensor, which is installed at the air inlet of the compressor; The step of reducing the opening of the first valve based on the first pressure value and starting the first heating component to heat the steam in the gas space includes: determining a first opening corresponding to the first pressure value, and reducing the opening of the first valve according to the first opening; Acquire a first temperature value of steam entering the compressor collected by the first temperature sensor; determining a first suction superheat of the compressor based on the first temperature value and the first pressure value; A first power of the first heating component is determined based on the first suction superheat, and the first heating component is started according to the first power to heat the steam in the gas space.

4. The method according to claim 3, characterized in that After determining the first power of the first heating component based on the first suction superheat, starting the first heating component according to the first power, and heating the steam in the gas space, the method further includes: Acquire a second pressure value of the steam entering the compressor collected by the first pressure sensor; determining a second opening corresponding to the second pressure value, and adjusting the opening of the first valve according to the second opening; Acquire a second temperature value of the steam entering the compressor collected by the first temperature sensor; determining a second suction superheat of the compressor based on the second temperature value and the second pressure value; A second power of the first heating component is determined based on the second suction air superheat, and the first heating component is adjusted according to the second power.

5. The method according to claim 1, characterized in that After the first pressure sensor acquires the first pressure value of the steam entering the compressor, the method further includes: When the first pressure value is less than a second pressure threshold, the opening of the first valve is increased.

6. The method according to claim 5, characterized in that The water vapor compression system further includes a second heating component, which is installed in the liquid space of the steam. The increasing the opening of the first valve includes: The opening of the first valve is increased based on the first pressure value, and the second heating component is started to heat the liquid in the liquid space; the second pressure threshold is less than the first pressure threshold.

7. The method according to claim 6, characterized in that After increasing the opening of the first valve based on the first pressure value and starting the second heating component, the method further includes: Acquire a third pressure value of the steam entering the compressor collected by the first pressure sensor; determining a third opening corresponding to the third pressure value, and adjusting the opening of the first valve according to the third opening; Determine a third power corresponding to the third pressure value, and adjust the second heating component according to the third power.

8. The method according to any one of claims 2 to 7, characterized in that: When the water vapor compression system includes a gas-liquid separator, the gas outlet of the steam generator is connected to the gas inlet of the gas-liquid separator, the gas outlet of the gas-liquid separator is connected to the gas inlet of the compressor, the gas space of the steam is located at the top of the gas-liquid separator, and the liquid space of the steam is located at the bottom of the gas-liquid separator; when the water vapor compression system does not include the gas-liquid separator, the gas outlet of the steam generator is connected to the gas inlet of the compressor, the gas space of the steam is located at the top of the steam generator, and the liquid space of the steam is located at the bottom of the steam generator.

9. The method according to claim 1, characterized in that: The water vapor compression system further includes: a second pressure sensor, a second valve, and a steam return pipeline, wherein the second pressure sensor is installed at the air outlet of the compressor, the steam return pipeline communicates with the air outlet of the compressor and the liquid space of the steam generator, and the second valve is installed between the steam return pipelines. The method further includes: acquiring a fourth pressure value of the steam output by the compressor collected by the second pressure sensor; When the fourth pressure value is greater than the third pressure threshold, obtaining a compression frequency of the compressor; When the compression frequency reaches a compression frequency threshold, the second valve is started to transport steam from the steam return pipeline to the liquid space. The compression frequency threshold is the minimum compression frequency value of the compressor.

10. The method according to claim 9, characterized in that The step of starting the second valve to transport steam from the steam return line to the liquid space comprises: A fourth opening corresponding to the fourth pressure value is determined, and the second valve is started according to the fourth opening to transport steam from the steam return pipeline to the liquid space.

11. The method according to claim 9, characterized in that The water vapor compression system also includes an air-to-water heat exchanger, which is installed in the liquid space of the steam generator. The steam return pipeline connects the air outlet of the compressor and the liquid space of the steam generator through the air-to-water heat exchanger. The steam output by the compressor is transported to the air-to-water heat exchanger through the steam return pipeline to heat the liquid contained in the liquid space of the steam generator.

12. The method according to claim 11, characterized in that The gas-water heat exchanger comprises a drainage pipe, which is connected to the outside and transports the liquid generated after the steam is heat-exchanged in the gas-water heat exchanger to the outside of the steam generator.

13. The method according to claim 1, characterized in that The water vapor compression system further includes: a liquid return pipeline, a second temperature sensor installed in the liquid space of the steam generator, and a third valve and a water pump installed in the liquid return pipeline, wherein the liquid return pipeline is in communication with the liquid space and the gas space of the steam generator, and after obtaining the first pressure value collected by the first pressure sensor, further includes: When the first pressure value is less than the second pressure threshold, obtaining a third temperature value of the liquid in the liquid space collected by the second temperature sensor; When the third temperature value reaches the temperature threshold, the water pump and the third valve are turned on.

14. A water vapor compression system, characterized in that: The water vapor compression system comprises: A memory for storing executable program codes; A processor is used to call and run the executable program code from the memory so that the water vapor compression system executes the method according to any one of claims 1 to 13.

15. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program code, and when the computer program code is executed, the method according to any one of claims 1 to 13 is implemented.

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